Optical Simulation And Optimization Of Quantum Dots For Micro-LED Colorization

Micro-LED has the advantages of high luminous efficiency,high luminance,high contrast and etc.,it has already became the important development direction of micro-manifestation and micro-projector,however,currently,and how to realize Micro-LED colorization has become problem that needs to be solved urgently.As quantum dot has high quantum yield,emission half peak width being narrow and grain size being small and other characters,it could provide very good solving protocol for colorization of Micro-LED.For planar type,concave type and protruding type red quantum dot and green quantum dot with equal volume and equal concentration,protruding type quantum dot could absorb more luminous energy of blue light that are radiate from Micro-LED,thus,there are more emission of exciting light.Under the circumstance that the quantum dot thickness is certain,with the increase of molar concentration of quantum dot from small to large,luminous energy of exciting light produced by exciting quantum dot of blue light Micro-LED could have the tendency of increase at first and decrease afterwards.The surface attributes of media getting in the light is set as three characters as hypersorption,specular refection and diffuse reflection,by changing the molar concentration of quantum dot,the influence of three different surface attributes on luminous character of quantum dot was analyzed,analog simulation results showed that media getting in the light that uses inner surface as diffuse reflection texture receives the maximum exciting light on receiving surface,while using inner surface as media getting in the light of hypersorption,as most exciting light is absorbed by media getting in the light,the exciting light received by receiving surface is the minimum.In addition,by simulation,it is found that with the increase of dip angle of media getting in the light,blue light penetrating quantum dot received by receiving surface is reduced gradually.When blue light Micro-LED stimulates red and green quantum dot to produce red and green light,to reduce the blue light that penetrates quantum dot and to obtain more exciting light,DBR is added on the upper region of the model,and DBR acts on model of media of getting in the light with three surface characters as hypersorption,specular reflection and diffuse reflection,by optic simulation,it is found that DBR has the best buff on exciting light when it is applied in model of media getting in the light with diffuse reflection.In order to cut more penetrated blue light and emit more excited light,the layers,shape and structure of DBR were optimized,and the simulation results showed that the combination structure of planar DBR and convex DBR could achieve the best effect.